Filament Transformers

MSI Filament TransformerFilament Transformers

Filament Transformers are single phase transformers used to drive the low impedance filament of an electron vacuum tube.


  • Power rating up to 10 KVA
  • Primary Voltage up to 600V
  • High current secondary: bus or lead connection depending on specification
  • Single phase
  • Frequency: 50 or 60 Hz
  • Aluminum or copper windings



  • High Impedance
  • Center Tapped secondary winding
  • UL Recognized insulation system (Primary must be 600V or less). MSI UL Insulation systems are available in 130°, 180° and 220°C ratings
  • CE marking with declaration of conformity ROHS and Low Voltage Directive where applicable
  • Private labeling with customer supplied nameplate artwork. Units that are private labeled cannot carry our UL label
  • Temperature monitoring thermal switches, thermocouples, or platinum RTD’s
  • Final Test Reports with optional Certificate of Compliance



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